I know there are some good studios in davao. For gear, you only have to go to Cebu... I think Audiophile and JB have branches there.
Choose the soundcard first then build your computer around that. In general, you can't go wrong with Asus motherboards, but this applies to their mid to higher range boards. If you can afford the X58/i7 combination, go for it and load it up with at least 6 gigs of ram. Alternative is to go core i5 with their P55 chipset. My experience with Asus has been overall good considering I have 2 very satisfied 'customers', Gerard and Marvin.
Then again, you could go MSI like I did, but I did my homework with this one. MSI has been good to me for DAW use, although my previous P35 blew a small chip when I overloaded the usb. That mobo probably still works although video seems to be dead... I figure I need a vidcard powered by the PSU but that would be a rather expensive experiment at this time. (I need a new vidcard though... this new game I have is making my existing card gasp for air, but my procie isn't even breaking a sweat).